Inner-tube guard for pneumatic tires.



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APPLIOATIOI FILED D20. 18, 1811.

Patented Dec. 17, 1912.

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Specification of Letters Patent.

Patented Dec. 17,1912.

Application filed December 18, 1011. Seriatlio. 665,419. I

This invention relates to improvements in tires, such as are commonly used on the wheels of automobiles motor-cycles and like vehicles, and particu arly to that class of tires comprising an outer tread surface, of relatively strong elastic material, and an inner tubular member adapted to be influted and upon which the resilience and easy riding qualities of the vehicle depend.

The object of this invention is to prevent blow-outs at weakened spots in the outer tires and also largely avoid punctures in the inner tube. These ob'ects are attained by the novel structure an disposition of parts hereinafter fully described and shown in the accompanving drawings forming part of this specification and in which Figure 1, is a developed plan view of a portion of a casing unit. Big. 2, is a sectional view of a unit portion showing the hand and straps. Fi 3, is a similar view of the same, showing t e opposite edge. Fig. 4, is a fragmentary view of an inner tube and casing looking from the side op site the tread surface. Fig. 5, is a partia side view and section of a wheel rim complete with tire, inner tube and casing, and, F1 6, is a cross section of the same taken on ine 6-43 of Fig. 5.

It. is known that when the outer tire be comes worn in places by service resulting in abrasion or cuts that the pressure in the highly inflated inner tube attacks these weakened spots causing bulges to protrude beyond the surface of the tire, which, coming in contact with rough or sharp-edged impediments burst, thereby deflating the tire and puttin r the wheel out of use until repairs have been made. It is also known that attempts have been made to remed this trouble by means of the interposition of shields or guards, but which lack the peculiar advantages of this device.

The invention consists of a. casing 10 for the inner tube 11 adapted to be disposed between it and the outer tire 12 and comprises a composite endless strip formed of several layers of strong woven fabric, such as canvas, each unitof which is cut diagonally or on the bias, so that the casing may be stretched or expanded without rupture and which will also contract when the pressure is removed.

In order to obtain the length necessary to form a complete casing several of these units may be connected at their sclvaged edges as cut from the sheet, the scams or joints being so formed as in no manner to interfere with its a plic'ation or use, the seams being arrange helically about the inner tube without ridges and in such manner that each is covered or overlaid by a portion of an adjacent striip unit so that the seams ar not oppositely isposed.

Alon both edges of the composite stri are V s a ed cut-outs or notches 13 extenci ing inwar ly, and of such size and frequency as may be necessary to permit of obtaining the roper shape when the edges of the in cised notches are brought together as at 14. Over the edges or margins of the strip, bands 15, which are also cut obliquely to the weaving, are secured by stitching, or other equivalent substantial means to keep the casing in its proper shape with the edges of the notches in contact and preventthem from spreading or separating.

Straps 16 and 16 are arranged in pairs on each side of the casing, one end of which is secured over the bands 15, at the oint of juncture at each incised notch, wiile the other end is made of adequate length to pass over the inner tube, these straps are provided with securin means, such as buckles 17, fastened to t e straps 16 on one side of the casing, while the op osite stra s 16 are adapted to engage wit the buck es holding the casing securely around the inner tube, which it completely incloscs.

In 0 oration the inner tube may be partially inflated, the casing or center guard arran ed about it and strapped in position,

then a l of the air let out, the casing put into the outer tire, the whole placed on a wheel and then the inner tire fully inflated in the usual manner.

As the fabric of the casing and bands is cut obliquely to the weave, or dis osition of the warp and woof, it is capabe of considerable contraction and expansion in cor respondence with the inner tube, but we vents the same from extrusion through or into the tread portion of the tire should an opening or cavity exist therein and thus obviet e blew-outsfbesides'iimterielly shield-j ing the inner. tube from-punctures'byreeson of its strength; yet' the 'reiis telncej of" the" material againsbobjects forcibly presented to it does not injure its's'uppleness'or quality of conformation to tlie tires.

Having thus'describeq iny invention; r vhzi t I claim as'new and'desirefo secureby Lettors Patent, is:

of textile'fa rie cut diagonally to .the weave thereof and havin shaped incisions formed at both e ges, said edges being brought a ther, blindesecured adjacent "'to each oft e ed es ofsaidcasing holding .the edges of the incisions in iniimate contact, thereby forming a hollow circular 0212 mg, end stra s arranged in (fairs on said bands over t e oints at 88.1 incisions to farina closure.

. In-testimony whereof, I have signed my name tothis specification in the presence of 'tvio subscribirga witnesses.

EGFRIED GOODMAN. Witnesses:

DANIEL W. RANTINE, HILDA L. Lweom'rz.

51-53322: 0! this patent may be obtained lor'flve-oengacach, by addressing the Oommlseioner of Eat-elite.

- Waahlngton, D. 0." 

